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Finding the Fourth Proportional to 77.56, 107.11 and 67.18

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Solution

The fourth proportional to 77.56, 107.11 and 67.18 is: 92.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.56 : 107.11 = 67.18 : x
  2. Step 2: Convert to fraction form
    77.56/107.11 = 67.18/x
  3. Step 3: Cross multiply
    77.56x = 107.11 × 67.18
  4. Step 4: Simplify right side
    77.56x = 7,195.55
  5. Step 5: Solve for x
    x = 7,195.55/77.56
  6. Step 6: Final answer
    x = 92.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.